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MECHANICAL TROLLING VALVE (M.T.V.)
The trolling valve is a mechanical device that allows the number of propeller revolutions to be chan-
ged independently of the engine running speed. The M.T.V. is usually applied in the following circum-
stances:
1) when the boat speed is too high, even though the engine is idling.
2) when the rotation speed of the PTO must be greater than the propeller rotation speed.
The M.T.V. can be used in both drive directions and the maximum running speeds are:
-
Maximum rotation speed = (max engine speed x 0.5) rpm, for engines with maximum running
-
Maximum rotation speed = (1000) rpm, for engines with maximum running speeds greater than
Use instructions
Check that the M.T.V. is deselected before engaging the gear. After engaging the gear, gradually move
the M.T.V. lever until the desired manoeuvre speed is reached.
When operating with trolling valve, the number of revolutions can be changed within the limits given
above.
It is forbidden to reverse the drive when the
M.T.V. is engaged.
ELECTRIC TROLLING VALVE (E.T.V.)
This is an electrical device that has the same functions and is used in the same way as the M.T.V.
The E.T.V. operates via a proportional solenoid valve.
Actual propeller speed can be 30 - 70 % lower than propeller speed capacity, depending on gear box
reduction ratio, propeller size and boat characteristics.
We recommend a range of use: 60 - 80 °C.
Cooling water connection.
The quantity of heat generated by the gearbox is partly dissipated by way of a heat exchanger con-
nected to the cooling water inlet and outlet pipes.
The water pipes must be connected to the heat exchanger in such a way as to avoid excessive tigh-
tening and stresses caused by thermal expansion.
We recommend the use of flexible connections.
TOWING
Towing can be done continuously for 8 hours. Check that the oil temperature does not go over 80°C.
The position of the control lever is of no importance when the engine is off.
Navigation by means of towing.
Ensure that the maximum speed of the output shaft does not exceed the following:
Max. rpm of output shaft = 1/3 x (Max engine rpm) : (Gearbox ratio).
Do not perform any operations on the transmission during towing, as the propeller may start turning.
Plus d'informations sur : www.dbmoteurs.fr
speeds less than 2000 rpm.
2000 rpm.
13 = pressure-gauge
connection
13
Fig. 5.1
9
GB
CLUTCH
SLIP
CLUTCH
PRESSURE
(Ratio of gearbox)
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